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Smoke, Fire & Gas Detection FAQs

Why is my mains powered smoke alarm beeping just after it was installed?

There are a number of possibilities as to why mains-powered smoke alarms might beep after installation:

1. The fuse to which the alarm is connected has not been switched back on. This is a very common occurrence.
2. The cable connection is incorrect, resulting in the alarm not receiving mains power. If left the backup battery will get drained.
3. If the alarm is connected to a nearby lighting circuit the connection might be wired incorrectly, interrupting the power supply when the lighting is switched off.
4. Sometimes, the backup battery of a rechargeable smoke alarm takes time to reach operating level and the alarm might beep for a short time.

Read our smoke alarm troubleshooting guide to find a full list of reasons and solutions.

View all smoke, fire & gas detection FAQs


 

Reviewed: 14/09/2023 (doc:536 V1.0). Our articles are reviewed regularly. However, any changes made to standards or legislation following the review date will not have been considered. Please note that we provide abridged, easy-to-understand guidance. To make detailed decisions about your fire safety provisions, you might require further advice or need to consult the full standards and legislation.

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